|
2SEETV QUICK GUIDE TO CHOOSING A NIGHT VISION
CAMERA
The
main criteria for selection of a night vision CCTV camera are:
Resolution – This
is described by the number of vertical lines the camera can display. If the
camera is looking at a test card of black vertical lines on a white background
it will be able to distinguish a change from black to white 380 times for a
380TVL (Television Lines) camera.
Most
domestic television sets cannot display more than 400TVL at best so you will
need to use a high resolution CCTV monitor to benefit from the higher resolution
cameras.
Sensitivity –
Measured in units of Lux, it describes when the camera will change from day to
night vision.
Lens
focal length – A
3.6mm lens will give a 72 deg angle of view so is wide angle. A 6mm lens gives
52 deg which will make objects larger but you loose side coverage.
Cameras
with a varifocal lens allow you to adjust the focal length at the time of
installation. Hence you can frame the picture to give the optimum field of view.
Note,
we can supply KT&C cameras with alternative focal lengths upon request.
CCD
– Sony, the original manufacturers of the CCD are still the market leaders. The
Sony Super HAD CCD gives excellent results. Most of our cameras are based on the
Sony CCD as tests have shown these products to give the best results. The EXView version has increased
sensitivity in both day and night modes. The sensitivity to infra red light is
improved by 4 times.
Infra Red beam transmission distance
– The IR beam can be thought of as an invisible torch beam. It’s invisible to
the human eye but not the camera. Like a torch beam it will fade with distance.
At night the further objects are from the camera the dimmer they will become.
The figures quoted are the manufacturers’ specification. It is advised to work
well within these figures and not expect bright images at the maximum distance.
Night
vision cameras work by objects reflecting back the infra red beam to the camera.
If the camera is looking at black tarmac it will display very little but as soon
as a person walks towards the camera they will start to reflect the beam and the
camera will display images.
OUR BEST SELLING NIGHT VISION CAMERAS
CG-182A/15M Colour Night Vision Sony CCD Camera – Zero Lux
Based
on the Sony CCD the image quality is excellent. The enclosure and mounting
bracket are basic. However, the high specifications of 420TV Lines and a
night-time viewing distance of 15 metres belie the low price. It is produced in
China
Concept Pro VLP15 Range
Superb
quality cameras backed by a 5 year warranty. A choice of resolutions from 380TVL
to 550TVL. The IR range of up to 15 Metres makes this product suitable for most
home or small business applications. The Sony ExView option gives improved
sensitivity, particularly at night.
Concept Pro VLP30 Range
This
range has a varifocal lens with a focal length adjustable from 4 to 9mm. This
makes it suitable for longer ranges or where greater magnification of objects is
required. They have an IR distance of up to 30 metres. A Sony EXView version is
available to give additional sensitivity.
Choose
the VLP3026 camera for night-time observation of long driveways or car parks adjacent
to larger premises.
All products in this range are backed by the Concept Pro 5
year warranty.
CG-50 KT&C Super Night Vision Monochrome External CCTV Camera - Zero Lux
KT&C,
based in Korea,
have been producing cameras of renowned quality for many years. This model uses
the Sony CCD and has a strong and weather resistant case and mounting bracket.
Choose this model if the main application is night-time monitoring and the
budget will not allow for colour day time viewing.
The
CG-50 is fitted with a 3.6mm lens which is ideal for most applications.
We can supply 6, 8 or 12mm focal lengths on request.
CG-N600PH KT&C Sony CCD Varifocal 30M Night Vision Camera
This
product has a high resolution of 520TVL, IR range up to 30 metres.
It has
a varifocal lens which is manually adjustable between 4 and 9mm. This allows you
to accurately frame the objects under surveillance.
Choose
this camera for night-time observation of long driveways or car parks adjacent
to larger premises.
|
